How to find the open circuit voltage?

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ltnghia1304
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Homework Statement


How can we find the open circuit voltage of this one:
Circuit schematic (a) with a 5 V source and resistors labeled 1 Ω, two shunt branches and a series ladder, ending in two output terminals; beside it, schematic (b) shows a Thevenin equivalent with source V0 and series resistor r.

Thank you

Homework Equations

The Attempt at a Solution

 
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What equations are relevant for solving these types of problems in general?